Re: nextval() clarification

Greg Donald wrote:

>On Mon, 13 Sep 2004 21:54:11 +0200, Ennio-Sr <nasr(dot)laili(at)tin(dot)it> wrote:
>
>
>>I think you should put <nextval(....)> directly into the INSERT
>>instruction, so that it advances only once per added record.
>>Have a look at Documentation PostgreSQL 7.4, Ch 9.11, table 9.34.
>>HTH
>>
>>
>
>I would but then I don't know how to ensure I return that exact same
>id from the insert, like mysql_insert_id() does. That's the whole
>reason why I aquire the id first, so I know what it is after the
>insert. SELECT max(id) would be off under load I think.
>
>I just didn't understand why it appeared to be +2 and not +1 as a
>novice might expect. But now I get it. Thanks to all.
>
>
>
After your insert statement, you can call CURRVAL to find out what the
value was that you
inserted into the serial column.

eg SELECT currval('companies_company_id_seq'::text)

Ron